Just use a smartphone everyone has one in their hand these days. The other person would not even be the wiser. I take pictures of shitty drivers as I go by them. Makes em paranoid LOL

A fellow here took a picture of somebody tailgating him with just inches to spare. He sent it to the police and they wrote him a warning ticket for using his cellular device while driving. Proving once again, the idiots always win.

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With great power comes Awesome irresponsibility.